Add UDP timeout route option

adapter/inbound.go

@@ -70,6 +70,8 @@ type InboundContext struct {
 	InboundOptions            option.InboundOptions
 	UDPDisableDomainUnmapping bool
 	UDPConnect                bool
+	UDPTimeout                time.Duration
+
 	NetworkStrategy     C.NetworkStrategy
 	NetworkType         []C.InterfaceType
 	FallbackNetworkType []C.InterfaceType

adapter/outbound/default.go

@@ -1,157 +0,0 @@
-package outbound
-
-import (
-	"context"
-	"net"
-	"net/netip"
-	"os"
-	"time"
-
-	"github.com/sagernet/sing-box/adapter"
-	"github.com/sagernet/sing-box/common/dialer"
-	C "github.com/sagernet/sing-box/constant"
-	"github.com/sagernet/sing/common"
-	"github.com/sagernet/sing/common/buf"
-	"github.com/sagernet/sing/common/bufio"
-	"github.com/sagernet/sing/common/canceler"
-	E "github.com/sagernet/sing/common/exceptions"
-	M "github.com/sagernet/sing/common/metadata"
-	N "github.com/sagernet/sing/common/network"
-)
-
-func NewConnection(ctx context.Context, this N.Dialer, conn net.Conn, metadata adapter.InboundContext) error {
-	defer conn.Close()
-	ctx = adapter.WithContext(ctx, &metadata)
-	var outConn net.Conn
-	var err error
-	if len(metadata.DestinationAddresses) > 0 {
-		outConn, err = dialer.DialSerialNetwork(ctx, this, N.NetworkTCP, metadata.Destination, metadata.DestinationAddresses, metadata.NetworkStrategy, metadata.NetworkType, metadata.FallbackNetworkType, metadata.FallbackDelay)
-	} else {
-		outConn, err = this.DialContext(ctx, N.NetworkTCP, metadata.Destination)
-	}
-	if err != nil {
-		return N.ReportHandshakeFailure(conn, err)
-	}
-	err = N.ReportConnHandshakeSuccess(conn, outConn)
-	if err != nil {
-		outConn.Close()
-		return err
-	}
-	return CopyEarlyConn(ctx, conn, outConn)
-}
-
-func NewPacketConnection(ctx context.Context, this N.Dialer, conn N.PacketConn, metadata adapter.InboundContext) error {
-	defer conn.Close()
-	ctx = adapter.WithContext(ctx, &metadata)
-	var (
-		outPacketConn      net.PacketConn
-		outConn            net.Conn
-		destinationAddress netip.Addr
-		err                error
-	)
-	if metadata.UDPConnect {
-		if len(metadata.DestinationAddresses) > 0 {
-			if parallelDialer, isParallelDialer := this.(dialer.ParallelInterfaceDialer); isParallelDialer {
-				outConn, err = dialer.DialSerialNetwork(ctx, parallelDialer, N.NetworkUDP, metadata.Destination, metadata.DestinationAddresses, metadata.NetworkStrategy, metadata.NetworkType, metadata.FallbackNetworkType, metadata.FallbackDelay)
-			} else {
-				outConn, err = N.DialSerial(ctx, this, N.NetworkUDP, metadata.Destination, metadata.DestinationAddresses)
-			}
-		} else {
-			outConn, err = this.DialContext(ctx, N.NetworkUDP, metadata.Destination)
-		}
-		if err != nil {
-			return N.ReportHandshakeFailure(conn, err)
-		}
-		outPacketConn = bufio.NewUnbindPacketConn(outConn)
-		connRemoteAddr := M.AddrFromNet(outConn.RemoteAddr())
-		if connRemoteAddr != metadata.Destination.Addr {
-			destinationAddress = connRemoteAddr
-		}
-	} else {
-		if len(metadata.DestinationAddresses) > 0 {
-			outPacketConn, destinationAddress, err = dialer.ListenSerialNetworkPacket(ctx, this, metadata.Destination, metadata.DestinationAddresses, metadata.NetworkStrategy, metadata.NetworkType, metadata.FallbackNetworkType, metadata.FallbackDelay)
-		} else {
-			outPacketConn, err = this.ListenPacket(ctx, metadata.Destination)
-		}
-		if err != nil {
-			return N.ReportHandshakeFailure(conn, err)
-		}
-	}
-	err = N.ReportPacketConnHandshakeSuccess(conn, outPacketConn)
-	if err != nil {
-		outPacketConn.Close()
-		return err
-	}
-	if destinationAddress.IsValid() {
-		var originDestination M.Socksaddr
-		if metadata.RouteOriginalDestination.IsValid() {
-			originDestination = metadata.RouteOriginalDestination
-		} else {
-			originDestination = metadata.Destination
-		}
-		if metadata.Destination != M.SocksaddrFrom(destinationAddress, metadata.Destination.Port) {
-			if metadata.UDPDisableDomainUnmapping {
-				outPacketConn = bufio.NewUnidirectionalNATPacketConn(bufio.NewPacketConn(outPacketConn), M.SocksaddrFrom(destinationAddress, metadata.Destination.Port), originDestination)
-			} else {
-				outPacketConn = bufio.NewNATPacketConn(bufio.NewPacketConn(outPacketConn), M.SocksaddrFrom(destinationAddress, metadata.Destination.Port), originDestination)
-			}
-		}
-		if natConn, loaded := common.Cast[bufio.NATPacketConn](conn); loaded {
-			natConn.UpdateDestination(destinationAddress)
-		}
-	}
-	switch metadata.Protocol {
-	case C.ProtocolSTUN:
-		ctx, conn = canceler.NewPacketConn(ctx, conn, C.STUNTimeout)
-	case C.ProtocolQUIC:
-		ctx, conn = canceler.NewPacketConn(ctx, conn, C.QUICTimeout)
-	case C.ProtocolDNS:
-		ctx, conn = canceler.NewPacketConn(ctx, conn, C.DNSTimeout)
-	}
-	return bufio.CopyPacketConn(ctx, conn, bufio.NewPacketConn(outPacketConn))
-}
-
-func CopyEarlyConn(ctx context.Context, conn net.Conn, serverConn net.Conn) error {
-	if cachedReader, isCached := conn.(N.CachedReader); isCached {
-		payload := cachedReader.ReadCached()
-		if payload != nil && !payload.IsEmpty() {
-			_, err := serverConn.Write(payload.Bytes())
-			payload.Release()
-			if err != nil {
-				serverConn.Close()
-				return err
-			}
-			return bufio.CopyConn(ctx, conn, serverConn)
-		}
-	}
-	if earlyConn, isEarlyConn := common.Cast[N.EarlyConn](serverConn); isEarlyConn && earlyConn.NeedHandshake() {
-		payload := buf.NewPacket()
-		err := conn.SetReadDeadline(time.Now().Add(C.ReadPayloadTimeout))
-		if err != os.ErrInvalid {
-			if err != nil {
-				payload.Release()
-				serverConn.Close()
-				return err
-			}
-			_, err = payload.ReadOnceFrom(conn)
-			if err != nil && !E.IsTimeout(err) {
-				payload.Release()
-				serverConn.Close()
-				return E.Cause(err, "read payload")
-			}
-			err = conn.SetReadDeadline(time.Time{})
-			if err != nil {
-				payload.Release()
-				serverConn.Close()
-				return err
-			}
-		}
-		_, err = serverConn.Write(payload.Bytes())
-		payload.Release()
-		if err != nil {
-			serverConn.Close()
-			return N.ReportHandshakeFailure(conn, err)
-		}
-	}
-	return bufio.CopyConn(ctx, conn, serverConn)
-}

constant/protocol.go

@@ -10,6 +10,7 @@ const (
 	ProtocolDTLS       = "dtls"
 	ProtocolSSH        = "ssh"
 	ProtocolRDP        = "rdp"
+	ProtocolNTP        = "ntp"
 )
 
 const (

constant/timeout.go

@@ -9,8 +9,6 @@ const (
 	TCPTimeout                 = 15 * time.Second
 	ReadPayloadTimeout         = 300 * time.Millisecond
 	DNSTimeout                 = 10 * time.Second
-	QUICTimeout                = 30 * time.Second
-	STUNTimeout                = 15 * time.Second
 	UDPTimeout                 = 5 * time.Minute
 	DefaultURLTestInterval     = 3 * time.Minute
 	DefaultURLTestIdleTimeout  = 30 * time.Minute
@@ -19,3 +17,18 @@ const (
 	FatalStopTimeout           = 10 * time.Second
 	FakeIPMetadataSaveInterval = 10 * time.Second
 )
+
+var PortProtocols = map[uint16]string{
+	53:   ProtocolDNS,
+	123:  ProtocolNTP,
+	3478: ProtocolSTUN,
+	443:  ProtocolQUIC,
+}
+
+var ProtocolTimeouts = map[string]time.Duration{
+	ProtocolDNS:  10 * time.Second,
+	ProtocolNTP:  10 * time.Second,
+	ProtocolSTUN: 10 * time.Second,
+	ProtocolQUIC: 30 * time.Second,
+	ProtocolDTLS: 30 * time.Second,
+}

docs/configuration/route/rule_action.md

@@ -41,7 +41,8 @@ See `route-options` fields below.
   "network_strategy": "",
   "fallback_delay": "",
   "udp_disable_domain_unmapping": false,
-  "udp_connect": false
+  "udp_connect": false,
+  "udp_timeout": ""
 }
 ```
 
@@ -86,6 +87,28 @@ do not support receiving UDP packets with domain addresses, such as Surge.
 
 If enabled, attempts to connect UDP connection to the destination instead of listen.
 
+#### udp_timeout
+
+Timeout for UDP connections.
+
+Setting a larger value than the UDP timeout in inbounds will have no effect.
+
+Default value for protocol sniffed connections:
+
+| Timeout | Protocol             |
+|---------|----------------------|
+| `10s`   | `dns`, `ntp`, `stun` |
+| `30s`   | `quic`, `dtls`       |
+
+If no protocol is sniffed, the following ports will be recognized as protocols by default:
+
+| Port | Protocol |
+|------|----------|
+| 53   | `dns`    |
+| 123  | `ntp`    |
+| 443  | `quic`   |
+| 3478 | `stun`   |
+
 ### reject
 
 ```json

docs/configuration/route/rule_action.zh.md

@@ -37,7 +37,8 @@ icon: material/new-box
   "network_strategy": "",
   "fallback_delay": "",
   "udp_disable_domain_unmapping": false,
-  "udp_connect": false
+  "udp_connect": false,
+  "udp_timeout": ""
 }
 ```
 
@@ -84,6 +85,28 @@ icon: material/new-box
 
 如果启用，将尝试将 UDP 连接 connect 到目标而不是 listen。
 
+#### udp_timeout
+
+UDP 连接超时时间。
+
+设置比入站 UDP 超时更大的值将无效。
+
+已探测协议连接的默认值：
+
+| 超时    | 协议                   |
+|-------|----------------------|
+| `10s` | `dns`, `ntp`, `stun` |
+| `30s` | `quic`, `dtls`       |
+
+如果没有探测到协议，以下端口将默认识别为协议：
+
+| 端口   | 协议     |
+|------|--------|
+| 53   | `dns`  |
+| 123  | `ntp`  |
+| 443  | `quic` |
+| 3478 | `stun` |
+
 ### reject
 
 ```json

option/rule_action.go

@@ -150,6 +150,7 @@ type RawRouteOptionsActionOptions struct {
 
 	UDPDisableDomainUnmapping bool               `json:"udp_disable_domain_unmapping,omitempty"`
 	UDPConnect                bool               `json:"udp_connect,omitempty"`
+	UDPTimeout                badoption.Duration `json:"udp_timeout,omitempty"`
 }
 
 type RouteOptionsActionOptions RawRouteOptionsActionOptions

option/wireguard.go

@@ -14,7 +14,7 @@ type WireGuardEndpointOptions struct {
 	PrivateKey string                           `json:"private_key"`
 	ListenPort uint16                           `json:"listen_port,omitempty"`
 	Peers      []WireGuardPeer                  `json:"peers,omitempty"`
-	UDPTimeout UDPTimeoutCompat                 `json:"udp_timeout,omitempty"`
+	UDPTimeout badoption.Duration               `json:"udp_timeout,omitempty"`
 	Workers    int                              `json:"workers,omitempty"`
 	DialerOptions
 }

protocol/group/selector.go

@@ -10,6 +10,7 @@ import (
 	C "github.com/sagernet/sing-box/constant"
 	"github.com/sagernet/sing-box/log"
 	"github.com/sagernet/sing-box/option"
+	"github.com/sagernet/sing/common/atomic"
 	E "github.com/sagernet/sing/common/exceptions"
 	"github.com/sagernet/sing/common/logger"
 	M "github.com/sagernet/sing/common/metadata"
@@ -21,17 +22,22 @@ func RegisterSelector(registry *outbound.Registry) {
 	outbound.Register[option.SelectorOutboundOptions](registry, C.TypeSelector, NewSelector)
 }
 
-var _ adapter.OutboundGroup = (*Selector)(nil)
+var (
+	_ adapter.OutboundGroup             = (*Selector)(nil)
+	_ adapter.ConnectionHandlerEx       = (*Selector)(nil)
+	_ adapter.PacketConnectionHandlerEx = (*Selector)(nil)
+)
 
 type Selector struct {
 	outbound.Adapter
 	ctx                          context.Context
-	outboundManager              adapter.OutboundManager
+	outbound                     adapter.OutboundManager
+	connection                   adapter.ConnectionManager
 	logger                       logger.ContextLogger
 	tags                         []string
 	defaultTag                   string
 	outbounds                    map[string]adapter.Outbound
-	selected                     adapter.Outbound
+	selected                     atomic.TypedValue[adapter.Outbound]
 	interruptGroup               *interrupt.Group
 	interruptExternalConnections bool
 }
@@ -40,7 +46,8 @@ func NewSelector(ctx context.Context, router adapter.Router, logger log.ContextL
 	outbound := &Selector{
 		Adapter:                      outbound.NewAdapter(C.TypeSelector, tag, nil, options.Outbounds),
 		ctx:                          ctx,
-		outboundManager:              service.FromContext[adapter.OutboundManager](ctx),
+		outbound:                     service.FromContext[adapter.OutboundManager](ctx),
+		connection:                   service.FromContext[adapter.ConnectionManager](ctx),
 		logger:                       logger,
 		tags:                         options.Outbounds,
 		defaultTag:                   options.Default,
@@ -55,15 +62,16 @@ func NewSelector(ctx context.Context, router adapter.Router, logger log.ContextL
 }
 
 func (s *Selector) Network() []string {
-	if s.selected == nil {
+	selected := s.selected.Load()
+	if selected == nil {
 		return []string{N.NetworkTCP, N.NetworkUDP}
 	}
-	return s.selected.Network()
+	return selected.Network()
 }
 
 func (s *Selector) Start() error {
 	for i, tag := range s.tags {
-		detour, loaded := s.outboundManager.Outbound(tag)
+		detour, loaded := s.outbound.Outbound(tag)
 		if !loaded {
 			return E.New("outbound ", i, " not found: ", tag)
 		}
@@ -77,7 +85,7 @@ func (s *Selector) Start() error {
 			if selected != "" {
 				detour, loaded := s.outbounds[selected]
 				if loaded {
-					s.selected = detour
+					s.selected.Store(detour)
 					return nil
 				}
 			}
@@ -89,16 +97,16 @@ func (s *Selector) Start() error {
 		if !loaded {
 			return E.New("default outbound not found: ", s.defaultTag)
 		}
-		s.selected = detour
+		s.selected.Store(detour)
 		return nil
 	}
 
-	s.selected = s.outbounds[s.tags[0]]
+	s.selected.Store(s.outbounds[s.tags[0]])
 	return nil
 }
 
 func (s *Selector) Now() string {
-	selected := s.selected
+	selected := s.selected.Load()
 	if selected == nil {
 		return s.tags[0]
 	}
@@ -114,10 +122,9 @@ func (s *Selector) SelectOutbound(tag string) bool {
 	if !loaded {
 		return false
 	}
-	if s.selected == detour {
+	if s.selected.Swap(detour) == detour {
 		return true
 	}
-	s.selected = detour
 	if s.Tag() != "" {
 		cacheFile := service.FromContext[adapter.CacheFile](s.ctx)
 		if cacheFile != nil {
@@ -132,7 +139,7 @@ func (s *Selector) SelectOutbound(tag string) bool {
 }
 
 func (s *Selector) DialContext(ctx context.Context, network string, destination M.Socksaddr) (net.Conn, error) {
-	conn, err := s.selected.DialContext(ctx, network, destination)
+	conn, err := s.selected.Load().DialContext(ctx, network, destination)
 	if err != nil {
 		return nil, err
 	}
@@ -140,32 +147,30 @@ func (s *Selector) DialContext(ctx context.Context, network string, destination
 }
 
 func (s *Selector) ListenPacket(ctx context.Context, destination M.Socksaddr) (net.PacketConn, error) {
-	conn, err := s.selected.ListenPacket(ctx, destination)
+	conn, err := s.selected.Load().ListenPacket(ctx, destination)
 	if err != nil {
 		return nil, err
 	}
 	return s.interruptGroup.NewPacketConn(conn, interrupt.IsExternalConnectionFromContext(ctx)), nil
 }
 
-// TODO
+func (s *Selector) NewConnectionEx(ctx context.Context, conn net.Conn, metadata adapter.InboundContext, onClose N.CloseHandlerFunc) {
-// Deprecated
-func (s *Selector) NewConnection(ctx context.Context, conn net.Conn, metadata adapter.InboundContext) error {
 	ctx = interrupt.ContextWithIsExternalConnection(ctx)
-	if legacyHandler, ok := s.selected.(adapter.ConnectionHandler); ok {
+	selected := s.selected.Load()
-		return legacyHandler.NewConnection(ctx, conn, metadata)
+	if outboundHandler, isHandler := selected.(adapter.ConnectionHandlerEx); isHandler {
+		outboundHandler.NewConnectionEx(ctx, conn, metadata, onClose)
 	} else {
-		return outbound.NewConnection(ctx, s.selected, conn, metadata)
+		s.connection.NewConnection(ctx, selected, conn, metadata, onClose)
 	}
 }
 
-// TODO
+func (s *Selector) NewPacketConnectionEx(ctx context.Context, conn N.PacketConn, metadata adapter.InboundContext, onClose N.CloseHandlerFunc) {
-// Deprecated
-func (s *Selector) NewPacketConnection(ctx context.Context, conn N.PacketConn, metadata adapter.InboundContext) error {
 	ctx = interrupt.ContextWithIsExternalConnection(ctx)
-	if legacyHandler, ok := s.selected.(adapter.PacketConnectionHandler); ok {
+	selected := s.selected.Load()
-		return legacyHandler.NewPacketConnection(ctx, conn, metadata)
+	if outboundHandler, isHandler := selected.(adapter.PacketConnectionHandlerEx); isHandler {
+		outboundHandler.NewPacketConnectionEx(ctx, conn, metadata, onClose)
 	} else {
-		return outbound.NewPacketConnection(ctx, s.selected, conn, metadata)
+		s.connection.NewPacketConnection(ctx, selected, conn, metadata, onClose)
 	}
 }
 

protocol/group/urltest.go

@@ -36,7 +36,8 @@ type URLTest struct {
 	outbound.Adapter
 	ctx                          context.Context
 	router                       adapter.Router
-	outboundManager              adapter.OutboundManager
+	outbound                     adapter.OutboundManager
+	connection                   adapter.ConnectionManager
 	logger                       log.ContextLogger
 	tags                         []string
 	link                         string
@@ -52,7 +53,8 @@ func NewURLTest(ctx context.Context, router adapter.Router, logger log.ContextLo
 		Adapter:                      outbound.NewAdapter(C.TypeURLTest, tag, []string{N.NetworkTCP, N.NetworkUDP}, options.Outbounds),
 		ctx:                          ctx,
 		router:                       router,
-		outboundManager:              service.FromContext[adapter.OutboundManager](ctx),
+		outbound:                     service.FromContext[adapter.OutboundManager](ctx),
+		connection:                   service.FromContext[adapter.ConnectionManager](ctx),
 		logger:                       logger,
 		tags:                         options.Outbounds,
 		link:                         options.URL,
@@ -70,13 +72,13 @@ func NewURLTest(ctx context.Context, router adapter.Router, logger log.ContextLo
 func (s *URLTest) Start() error {
 	outbounds := make([]adapter.Outbound, 0, len(s.tags))
 	for i, tag := range s.tags {
-		detour, loaded := s.outboundManager.Outbound(tag)
+		detour, loaded := s.outbound.Outbound(tag)
 		if !loaded {
 			return E.New("outbound ", i, " not found: ", tag)
 		}
 		outbounds = append(outbounds, detour)
 	}
-	group, err := NewURLTestGroup(s.ctx, s.outboundManager, s.logger, outbounds, s.link, s.interval, s.tolerance, s.idleTimeout, s.interruptExternalConnections)
+	group, err := NewURLTestGroup(s.ctx, s.outbound, s.logger, outbounds, s.link, s.interval, s.tolerance, s.idleTimeout, s.interruptExternalConnections)
 	if err != nil {
 		return err
 	}
@@ -160,18 +162,14 @@ func (s *URLTest) ListenPacket(ctx context.Context, destination M.Socksaddr) (ne
 	return nil, err
 }
 
-// TODO
+func (s *URLTest) NewConnectionEx(ctx context.Context, conn net.Conn, metadata adapter.InboundContext, onClose N.CloseHandlerFunc) {
-// Deprecated
-func (s *URLTest) NewConnection(ctx context.Context, conn net.Conn, metadata adapter.InboundContext) error {
 	ctx = interrupt.ContextWithIsExternalConnection(ctx)
-	return outbound.NewConnection(ctx, s, conn, metadata)
+	s.connection.NewConnection(ctx, s, conn, metadata, onClose)
 }
 
-// TODO
+func (s *URLTest) NewPacketConnectionEx(ctx context.Context, conn N.PacketConn, metadata adapter.InboundContext, onClose N.CloseHandlerFunc) {
-// Deprecated
-func (s *URLTest) NewPacketConnection(ctx context.Context, conn N.PacketConn, metadata adapter.InboundContext) error {
 	ctx = interrupt.ContextWithIsExternalConnection(ctx)
-	return outbound.NewPacketConnection(ctx, s, conn, metadata)
+	s.connection.NewPacketConnection(ctx, s, conn, metadata, onClose)
 }
 
 func (s *URLTest) InterfaceUpdated() {

route/conn.go

@@ -6,11 +6,14 @@ import (
 	"net"
 	"net/netip"
 	"sync/atomic"
+	"time"
 
 	"github.com/sagernet/sing-box/adapter"
 	"github.com/sagernet/sing-box/common/dialer"
+	C "github.com/sagernet/sing-box/constant"
 	"github.com/sagernet/sing/common"
 	"github.com/sagernet/sing/common/bufio"
+	"github.com/sagernet/sing/common/canceler"
 	E "github.com/sagernet/sing/common/exceptions"
 	"github.com/sagernet/sing/common/logger"
 	M "github.com/sagernet/sing/common/metadata"
@@ -201,6 +204,21 @@ func (m *ConnectionManager) NewPacketConnection(ctx context.Context, this N.Dial
 			natConn.UpdateDestination(destinationAddress)
 		}
 	}
+	var udpTimeout time.Duration
+	if metadata.UDPTimeout > 0 {
+		udpTimeout = metadata.UDPTimeout
+	} else {
+		protocol := metadata.Protocol
+		if protocol == "" {
+			protocol = C.PortProtocols[metadata.Destination.Port]
+		}
+		if protocol != "" {
+			udpTimeout = C.ProtocolTimeouts[protocol]
+		}
+	}
+	if udpTimeout > 0 {
+		ctx, conn = canceler.NewPacketConn(ctx, conn, udpTimeout)
+	}
 	destination := bufio.NewPacketConn(remotePacketConn)
 	if ctx.Done() != nil {
 		onClose = N.AppendClose(onClose, m.monitor.Add(ctx, conn))

route/route.go

@@ -132,23 +132,11 @@ func (r *Router) routeConnection(ctx context.Context, conn net.Conn, metadata ad
 	if r.tracker != nil {
 		conn = r.tracker.RoutedConnection(ctx, conn, metadata, selectedRule, selectedOutbound)
 	}
-	legacyOutbound, isLegacy := selectedOutbound.(adapter.ConnectionHandler)
+	if outboundHandler, isHandler := selectedOutbound.(adapter.ConnectionHandlerEx); isHandler {
-	if isLegacy {
+		outboundHandler.NewConnectionEx(ctx, conn, metadata, onClose)
-		err = legacyOutbound.NewConnection(ctx, conn, metadata)
-		if err != nil {
-			conn.Close()
-			if onClose != nil {
-				onClose(err)
-			}
-			return E.Cause(err, F.ToString("outbound/", selectedOutbound.Type(), "[", selectedOutbound.Tag(), "]"))
 	} else {
-			if onClose != nil {
-				onClose(nil)
-			}
-		}
-		return nil
-	}
 		r.connection.NewConnection(ctx, selectedOutbound, conn, metadata, onClose)
+	}
 	return nil
 }
 
@@ -440,6 +428,9 @@ match:
 			if routeOptions.UDPConnect {
 				metadata.UDPConnect = true
 			}
+			if routeOptions.UDPTimeout > 0 {
+				metadata.UDPTimeout = routeOptions.UDPTimeout
+			}
 		}
 		switch action := currentRule.Action().(type) {
 		case *rule.RuleActionSniff:

route/rule/rule_action.go

@@ -47,6 +47,7 @@ func NewRuleAction(ctx context.Context, logger logger.ContextLogger, action opti
 			FallbackDelay:             time.Duration(action.RouteOptionsOptions.FallbackDelay),
 			UDPDisableDomainUnmapping: action.RouteOptionsOptions.UDPDisableDomainUnmapping,
 			UDPConnect:                action.RouteOptionsOptions.UDPConnect,
+			UDPTimeout:                time.Duration(action.RouteOptionsOptions.UDPTimeout),
 		}, nil
 	case C.RuleActionTypeDirect:
 		directDialer, err := dialer.New(ctx, option.DialerOptions(action.DirectOptions))
@@ -152,6 +153,7 @@ type RuleActionRouteOptions struct {
 	FallbackDelay             time.Duration
 	UDPDisableDomainUnmapping bool
 	UDPConnect                bool
+	UDPTimeout                time.Duration
 }
 
 func (r *RuleActionRouteOptions) Type() string {